<html>
<head>
	<meta charset="UTF-8">
	<meta content="IE=edge" http-equiv="X-UA-Compatible">
	<meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width" name="viewport">
	<title>2859：[Ceoi2012]Sailing Race</title>
	<!-- css -->
	<link href="../css/base.min.css" rel="stylesheet">
	<link href="../css/project.min.css" rel="stylesheet">
	
	<!-- favicon -->
	<!-- ... -->
</head>
<body class="page-brand">
	<header class="header header-transparent header-waterfall ui-header">
		<ul class="nav nav-list pull-left">
			<li>
				<a data-toggle="menu" href="#menu">
					<span class="icon icon-lg">menu</span>
				</a>
			</li>
		</ul>
		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Ceoi2012]Sailing Race</a>
		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Ceoi2012]Sailing Race</span>
	</header>
	<nav aria-hidden="true" class="menu" id="menu" tabindex="-1">
		<div class="menu-scroll">
			<div class="menu-content">
				<a class="menu-logo" href="../index.html">BZOJ离线题库</a>
				<ul class="nav">
					<li>
						<a class="waves-attach" data-toggle="collapse" href="#problems">题目</a>
						<ul class="menu-collapse collapse in" id="problems">
							<li>
								<a class="waves-attach" href="../index.html">主页</a>
							</li>
							<li>
								<a class="waves-attach" href="../list.html">题目列表</a>
							</li>
						</ul>
					</li>
					<li>
						<a class="collapsed waves-attach" data-toggle="collapse" href="#about">关于</a>
						<ul class="menu-collapse collapse" id="about">
							<li>
								<a class="waves-attach" href="../about.html">关于此项目</a>
							</li>
						</ul>
					</li>
					
				</ul>
			</div>
		</div>
	</nav>
	<main class="content">
		<div class="content-header ui-content-header">
			<div class="container">
				<h1 class="content-heading">
                [Ceoi2012]Sailing Race                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
		</div>
		<div class="container">
			<section class="content-inner margin-top-no">
				<div class="row">
					<div class="col-lg-13 col-md-13">
						<div class="card margin-bottom-no">
							<div class="card-main">
								<div class="card-inner">
									
                                <h3>题目描述</h3><p><div style="margin: 0cm 0cm 0pt 0.1pt; text-indent: 24.25pt"><span style="font-size: 12pt">在一个圆环上，有</span><i><span style="font-size: 12pt">N</span></i><span style="font-size: 12pt">个地点，这些地点按照逆时针顺序用正整数</span><span style="font-size: 12pt">1..<i>N</i></span><span style="font-size: 12pt">编号。有些地点间存在直线道路可以到达，但道路并不是双向的，也就是说如果存在</span><i><span style="font-size: 12pt">a</span></i><span style="font-size: 12pt">到</span><i><span style="font-size: 12pt">b</span></i><span style="font-size: 12pt">的道路，不一定同时存在</span><i><span style="font-size: 12pt">b</span></i><span style="font-size: 12pt">到</span><i><span style="font-size: 12pt">a</span></i><span style="font-size: 12pt">的道路。</span></div>
<div style="margin: 0cm 0cm 0pt 0.1pt; text-indent: 24.25pt"><span style="font-size: 12pt">现在你要从某个地点开始，沿着道路走，每个地点最多被经过一次，并且你走过的道路对应的线段只能在公共端点处相交。</span></div>
<div style="margin: 0cm 0cm 0pt 0.1pt; text-indent: 24.25pt"><span style="font-size: 12pt">但是有时候允许一些特例，具体说就是你走过的某条道路可以和最初走的道路相交最多一次。</span></div>
<div style="margin: 0cm 0cm 0pt 0.1pt; text-indent: 24.25pt"><span style="font-size: 12pt">你的任务是求出最多能走过的道路数，并给出一个可行的起点。</span></div>
<div style="margin: 0cm 0cm 0pt 0.1pt; text-indent: 24.25pt"><span style="font-size: 12pt"><img height="267" width="294" alt="" src="../file/2859_0.jpg" /></span></div>
<div>&nbsp;</div>
<div style="text-indent: 21.25pt"></div></p><hr/><h3>输入格式</h3><p><div style="text-indent: 21.25pt"><span style="font-size: 12pt">第一行两个非负整数</span><i><span style="font-size: 12pt">N</span></i><span style="font-size: 12pt">, <i>K</i></span><span style="font-size: 12pt">。如果</span><i><span style="font-size: 12pt">K </span></i><span style="font-size: 12pt">= 0</span><span style="font-size: 12pt">表示不允许特例，</span><i><span style="font-size: 12pt">K</span></i><span style="font-size: 12pt"> = 1</span><span style="font-size: 12pt">表示允许特例。</span></div>
<div style="text-indent: 21.25pt"><span style="font-size: 12pt">下面</span><i><span style="font-size: 12pt">N</span></i><span style="font-size: 12pt">行，依次描述每个地点可以到达的地点编号。每行以</span><span style="font-size: 12pt">0</span><span style="font-size: 12pt">结束。</span></div>
<div>&nbsp;</div>
<div style="text-indent: 21.25pt"></div></p><hr/><h3>输出格式</h3><p><div style="text-indent: 21.25pt"><span style="font-size: 12pt">第一行一个非负整数，表示最多可以走的道路数。第二行一个正整数，表示一个可行的起点编号。如果存在多个起点满足要求，输出其中任何一个都可以。</span></div>
<div>&nbsp;</div>
<div style="text-indent: 21.25pt"></div></p><hr/><h3>样例输入</h3><pre>7 1
5 0
5 0
7 0
3 0
4 0
4 3 0
2 1 0
 
</pre><hr/><h3>样例输出</h3><pre>5
2
 

 
</pre><hr/><h3>提示</h3><p><p>对于100%的数据满足：N &le; 500。<br />
</p>
<p>请不要提交！</p></p><hr/><h3>题目来源</h3><p>鸣谢Oimaster</p>
								</div>
							</div>
						</div>
					</div>
				</div>
				
				
			</section>
		</div>
	</main>

	<div class="fbtn-container">
		<div class="fbtn-inner">
			<a class="fbtn fbtn-lg fbtn-brand-accent waves-attach waves-circle waves-light waves-effect" data-toggle="dropdown" aria-expanded="true"><span class="fbtn-text fbtn-text-left">Menu</span><span class="fbtn-ori icon">apps</span><span class="fbtn-sub icon">close</span></a>
			<div class="fbtn-dropup">
				<a class="fbtn fbtn-brand waves-attach waves-circle waves-light waves-effect" href="../list.html" target="_self"><span class="fbtn-text fbtn-text-left">题目列表</span><span class="icon">menu</span></a>
				<a class="fbtn fbtn-green waves-attach waves-circle waves-effect" href="../index.html" target="_self"><span class="fbtn-text fbtn-text-left">返回主页</span><span class="icon">home</span></a>
				<a class="fbtn waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/submitpage.php?id=2859" target="_blank"><span class="fbtn-text fbtn-text-left">提交代码</span><span class="icon">send</span></a>
				<a class="fbtn fbtn-orange waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/wttl/wttl.php?pid=2859" target="_blank"><span class="fbtn-text fbtn-text-left">试题讨论</span><span class="icon">chat</span></a>
				
			</div>
		</div>
	</div>

	<!-- js -->
	<script src="../js/jquery.min.js"></script>
	<script src="../js/base.min.js"></script>
	<script src="../js/project.min.js"></script>
</body>
</html>